Class XII · Biology practice
Sexual Reproduction in Flowering Plants MCQs
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501 questions in this collection · Page 28 of 51
Question 271 of 501
📘 CLASS XII
Sexual Reproduction In Flowering Plants
Self-incompatibility is a device to prevent inbreeding. It is a:
The third device to prevent inbreeding is self-incompatibility. This is a genetic mechanism.
Question 272 of 501
📘 CLASS XII
Sexual Reproduction In Flowering Plants
What guides the pollen tube into the synergid?
Filiform apparatus present at the micropylar part of the synergids guides the entry of pollen tube.
Question 273 of 501
📘 CLASS XII
Sexual Reproduction In Flowering Plants
Bagging of the emasculated flower is done to:
Emasculated flowers have to be covered with a bag... to prevent contamination of its stigma with unwanted pollen.
Question 274 of 501
📘 CLASS XII
Sexual Reproduction In Flowering Plants
The fusion of the male gamete with the egg cell is called:
One of the male gametes moves towards the egg cell and fuses with its nucleus thus completing the syngamy.
Question 275 of 501
📘 CLASS XII
Sexual Reproduction In Flowering Plants
Which of the following statements about the Primary Endosperm Nucleus (PEN) is correct?
The other male gamete moves towards the two polar nuclei... and fuses with them to produce a triploid primary endosperm nucleus (PEN).
Question 276 of 501
📘 CLASS XII
Sexual Reproduction In Flowering Plants
Which part of the embryo is located above the level of attachment of the scutellum in monocots?
The portion of the embryonal axis above the level of attachment of scutellum is the epicotyl.
Question 277 of 501
📘 CLASS XII
Sexual Reproduction In Flowering Plants
In the seed, the micropyle facilitates the entry of:
The micropyle remains as a small pore in the seed coat. This facilitates entry of oxygen and water into the seed during germination.
Question 278 of 501
📘 CLASS XII
Sexual Reproduction In Flowering Plants
Which of the following records refers to a seed that germinated after 2000 years?
A recent record of 2000 years old viable seed is of the date palm, Phoenix dactylifera.
Question 279 of 501
📘 CLASS XII
Sexual Reproduction In Flowering Plants
Hybrid seeds lose their value if the progeny:
If the seeds collected from hybrids are sown, the plants in the progeny will segregate and do not maintain hybrid characters.
Question 280 of 501
📘 CLASS XII
Sexual Reproduction In Flowering Plants
Who popularized the use of embryological characters in taxonomy?
He worked on embryological aspects and popularised the use of embryological characters in taxonomy.
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